| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/kernel/cpcmd.c |
| 3 | * |
| 4 | * S390 version |
| 5 | * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), |
| 7 | * Christian Borntraeger (cborntra@de.ibm.com), |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/spinlock.h> |
| 14 | #include <linux/stddef.h> |
| 15 | #include <linux/string.h> |
| 16 | #include <asm/ebcdic.h> |
| 17 | #include <asm/cpcmd.h> |
| 18 | #include <asm/system.h> |
| 19 | |
| 20 | static DEFINE_SPINLOCK(cpcmd_lock); |
| 21 | static char cpcmd_buf[240]; |
| 22 | |
| 23 | /* |
| 24 | * the caller of __cpcmd has to ensure that the response buffer is below 2 GB |
| 25 | */ |
| 26 | void __cpcmd(char *cmd, char *response, int rlen) |
| 27 | { |
| 28 | const int mask = 0x40000000L; |
| 29 | unsigned long flags; |
| 30 | int cmdlen; |
| 31 | |
| 32 | spin_lock_irqsave(&cpcmd_lock, flags); |
| 33 | cmdlen = strlen(cmd); |
| 34 | BUG_ON(cmdlen > 240); |
| 35 | strcpy(cpcmd_buf, cmd); |
| 36 | ASCEBC(cpcmd_buf, cmdlen); |
| 37 | |
| 38 | if (response != NULL && rlen > 0) { |
| 39 | memset(response, 0, rlen); |
| 40 | #ifndef CONFIG_ARCH_S390X |
| 41 | asm volatile ("LRA 2,0(%0)\n\t" |
| 42 | "LR 4,%1\n\t" |
| 43 | "O 4,%4\n\t" |
| 44 | "LRA 3,0(%2)\n\t" |
| 45 | "LR 5,%3\n\t" |
| 46 | ".long 0x83240008 # Diagnose X'08'\n\t" |
| 47 | : /* no output */ |
| 48 | : "a" (cpcmd_buf), "d" (cmdlen), |
| 49 | "a" (response), "d" (rlen), "m" (mask) |
| 50 | : "cc", "2", "3", "4", "5" ); |
| 51 | #else /* CONFIG_ARCH_S390X */ |
| 52 | asm volatile (" lrag 2,0(%0)\n" |
| 53 | " lgr 4,%1\n" |
| 54 | " o 4,%4\n" |
| 55 | " lrag 3,0(%2)\n" |
| 56 | " lgr 5,%3\n" |
| 57 | " sam31\n" |
| 58 | " .long 0x83240008 # Diagnose X'08'\n" |
| 59 | " sam64" |
| 60 | : /* no output */ |
| 61 | : "a" (cpcmd_buf), "d" (cmdlen), |
| 62 | "a" (response), "d" (rlen), "m" (mask) |
| 63 | : "cc", "2", "3", "4", "5" ); |
| 64 | #endif /* CONFIG_ARCH_S390X */ |
| 65 | EBCASC(response, rlen); |
| 66 | } else { |
| 67 | #ifndef CONFIG_ARCH_S390X |
| 68 | asm volatile ("LRA 2,0(%0)\n\t" |
| 69 | "LR 3,%1\n\t" |
| 70 | ".long 0x83230008 # Diagnose X'08'\n\t" |
| 71 | : /* no output */ |
| 72 | : "a" (cpcmd_buf), "d" (cmdlen) |
| 73 | : "2", "3" ); |
| 74 | #else /* CONFIG_ARCH_S390X */ |
| 75 | asm volatile (" lrag 2,0(%0)\n" |
| 76 | " lgr 3,%1\n" |
| 77 | " sam31\n" |
| 78 | " .long 0x83230008 # Diagnose X'08'\n" |
| 79 | " sam64" |
| 80 | : /* no output */ |
| 81 | : "a" (cpcmd_buf), "d" (cmdlen) |
| 82 | : "2", "3" ); |
| 83 | #endif /* CONFIG_ARCH_S390X */ |
| 84 | } |
| 85 | spin_unlock_irqrestore(&cpcmd_lock, flags); |
| 86 | } |
| 87 | |
| 88 | EXPORT_SYMBOL(__cpcmd); |
| 89 | |
| 90 | #ifdef CONFIG_ARCH_S390X |
| 91 | void cpcmd(char *cmd, char *response, int rlen) |
| 92 | { |
| 93 | char *lowbuf; |
| 94 | if ((rlen == 0) || (response == NULL) |
| 95 | || !((unsigned long)response >> 31)) |
| 96 | __cpcmd(cmd, response, rlen); |
| 97 | else { |
| 98 | lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA); |
| 99 | if (!lowbuf) { |
| 100 | printk(KERN_WARNING |
| 101 | "cpcmd: could not allocate response buffer\n"); |
| 102 | return; |
| 103 | } |
| 104 | __cpcmd(cmd, lowbuf, rlen); |
| 105 | memcpy(response, lowbuf, rlen); |
| 106 | kfree(lowbuf); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | EXPORT_SYMBOL(cpcmd); |
| 111 | #endif /* CONFIG_ARCH_S390X */ |